256354551 has 12 divisors (see below), whose sum is σ = 384004712. Its totient is φ = 170902872.

The previous prime is 256354541. The next prime is 256354589. The reversal of 256354551 is 155453652.

256354551 is a `hidden beast` number, since 2 + 5 + 63 + 545 + 51 = 666.

It is not a de Polignac number, because 256354551 - 2⁶ = 256354487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256354541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 527236 + ... + 527721.

Almost surely, 2^256354551 is an apocalyptic number.

256354551 is a deficient number, since it is larger than the sum of its proper divisors (127650161).

256354551 is an equidigital number, since it uses as much as digits as its factorization.

256354551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054972 (or 1054960 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 256354551 is about 16011.0758851490. The cubic root of 256354551 is about 635.2534181852.

The spelling of 256354551 in words is "two hundred fifty-six million, three hundred fifty-four thousand, five hundred fifty-one".